    $primary-color: #1F1F1F;
    $gray-color: #999999;
    $tip-color: #666666;
    $tip2-color: #A3A3A3;

    .content {
        width: 100vw;
        height: 100vh;
        position: relative;
        overflow: hidden;
        color: $primary-color;
    }

    .black-btn {
        width: calc(100% - 36px);
        height: 42px;
        background: $primary-color;
        font-size: 12px;
        color: #FFFFFF;
        display: flex;
        justify-content: center;
        align-items: center;
        letter-spacing: 1px;
    }

    .flex-center {
        display: flex;
        justify-content: center;
        align-items: center;
    }

    .flex-center-col {
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
    }

    canvas {
        position: relative;
        z-index: 1;
    }